YZ250F dies in mud...help

8 replies to this topic
  • revitup

Posted 25 February 2003 - 07:30 AM

#1


I'm getting ready to take my bike in for shock service and was going to ask the technician about the following problem.

I wanted to see if anyone had any comments or experienced this.

NOTE: This only happens when it's muddy out.

First time it happened -> I would be going around and the bike would just die. It then would not start. I changed the plug and nothing. I then cleaned the bike after packing up and going home and it started right away. I attributed it to too much mud clogging up all the hoses that hang down.

At the next muddy event it did the same thing. After wacking the mud off the tubes, it started and ran again. Another rider then showed me another tube that had mud on it and possibly clogged, the head breather tube, this was hanging down pretty far. We then pulled the tubes up an inch or so, and the breather coming out of the head got zip-tied to the frame, instead of dangling. The bike ran fine the rest of the day but the track was also drying out and between rests I would wack any mud off. This doesn't seem right as I saw some MX races where bikes are covered in mud more than mine.

Thanks,

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  • cmiller250f

Posted 25 February 2003 - 07:42 AM

#2

On my bike I split the ends of all the breather hoses coming off of the carb. That way it is harder to get completely clogged. Just take a razorblade and split the hose lengthways about 3/4-1 inch. Be careful not to cut yourself. I don't have problems with them clogging up and they do extend 4-5 inches below the frame. I ride on Mx tracks and are pretty muddy in the morning during practice.

Later.

  • WR_wv

Posted 25 February 2003 - 09:56 AM

#3

All of my hoses on my 03' were cut/split about 1" from the factory. It really helps the mud to fall out.

You may want to try cutting a 45* angle on the ends also. In addition to the slits. :)

Good luck

  • av

Posted 25 February 2003 - 10:12 AM

#4

revitup - have a look at Steve Unruh's web page here, read about the "valve cover breather hose" and about the carb's "vent hose" - do these "swamp proof" mods and you should be good to go in mud/water conditions...

  • revitup

Posted 25 February 2003 - 10:55 AM

#5

Great! I'll give these suggestions a try. Now for the snow to start melting. :) Just heard we could get more this Thursday.

  • DethWshBkr

Posted 25 February 2003 - 06:23 PM

#6

Are you STILL having stalling problems!?!!??!?!!?!

I thought we took care of that at Rocket!!!!!

Hopefully one of these guys' tips will do the thing, cause other than the hoses being clogged up, I'm beat!



Yeah, I heard up to another 4 inches of snow.
This curent crap is freezing so solid that it won't even melt unless we get a hard, steady rain, and at least 45-195 degrees for a week solid, not dropping below freezing!!!

The next hare scramble is the 9th, and I plan on running, as long as the snow doens't cause issues!!!!!!! :)

  • z4me

Posted 26 February 2003 - 03:50 AM

#7

The hints on SUnruh's page will fix it. I regularly traveled through feet of mud the last two springtimes - never did the engine even cough.

  • av

Posted 26 February 2003 - 07:38 AM

#8

Sean - you've been living in your Land Cruiser for a long time now (in your avatar)! How do you shower?! :)

...Ummm, what's that smell? :D :D

  • z4me

Posted 26 February 2003 - 07:54 AM

#9

LOL - you don't know the half of it. Moving into an apartment this weekend though. I'll have to powerwash the interior of the cruiser as soon as it thaws :)



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